Mixing tube



FIG. 1 is a side perspective view of the mixing tube according to theinvention;

FIG. 2 is a side perspective view of the mixing tube thereof;

FIG. 3 is a bottom plan view of the mixing tube thereof;

FIG. 4 is a top plan view of the mixing tube thereof;

FIG. 5 is side perspective view of the mixing tube thereof;

FIG. 6 is a side plan view of the mixing tube thereof; and,

FIG. 7 is a side plan view of the mixing tube thereof.

The ornamental design for a mixing tube, as shown and described. 